Chain-grate stoker.



No. 878,085. I PATBNTBD FEB. 4,1808. A. E. PARKER & E. H. PEABODY.

CHAIN GRATE STOKER.

APPLICATION FILED 06213.24, 1906.

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661014344 New Lmomn No. 878,085. PATENTED FEB. 4, 1908. A. B. PARKER & E. H. PEABODY.

CHAIN GRATB 'STOKER.

APPLICATION FILED 00124, 1906.

3 SHEETSSHEET 2.

No.j878,085. PATENTED FEB. 4, 1908. A. PARKER & B. H. PBABODY,

CHAIN GRATE STOKER. APPLICATION FILED OCT. 24. 1906.

3 SHEETS-SHEET 8.

ALFRED EDWARD PARKER,

OF LONDON, ENGLAND, OF NEW YORK, I\'. Y.

AND ERNEST H. PEABODY,

CHAIN-GRATE STOKER.

To all whom it may concern:

Be it known that we, ALFRED and ERNEST ll. PFABODY, respectively a subject of the King of Great Britain and a citizen of the United States, residing, respectively, atliond'on', England, and .\"ew York city, int-he county of Sew York and State of New York, United States of America, have invented certain new and useful improvements the traveling grate in a uniform 1 straight openings in Chain-Grate Stokers, of which the follow ing is a specification, reference being had therein to the accompanying drawing,

This invention relates to 'rate. bars foruse with traveling grates for feet ing fuel to boiler and other furnaces, and it consists of a novel construction and arrangement of said bar by means of which the grate is adapted for use for burning the cheaper grades of fuel such as screenings or coal dust. In traveling grates of this description, the green coal isf'ed upon bed, which then passes under an incandescent fire brick arch or other structure by the volatile gases are driven off and the fuel is ignited) This ignition of fuel begins upon the top of the layer and gradually works downward until the entire mass of fuel is ignited and gradually burns away. The lower portion of the bed of green fuel therefore remains in contact'with the grate proper and travels some distance before it becomes ignited. During this time, which may be so long as 20'or 30 minutes, the tendency of the reen fuel is to sift downward between the am of the grate, thisaction being greatly increased when the coal fed upon the grate is veryfine or contains a large portion of dust. All of the fine coal which sifts through the grate in this manner is eitherlost in the refuse or must be removed from the pit below the grate and again fed small an amount as possible.

In ordinary traveling grates the openings through which the coal drops i below are of considerable length are no surfaces below to catch the prevent its dropping through.

In the present invention have found that sifting ol' the eoa prevented by shortening the coal and l is largely l ngth E. PARKER means of which the. applicants specificationyii -Letters Patent. Application and oncho 24, 1996. Serial in. 340.311,

into the furnace, and it is desirable to reduce this sifting process to as nto the pit and there 5 obvious that the lugs may be formed onone ("l between the bars; the long narrow opening will allow much more coal to 5 fall through than if it is divided into a num- Patented Feb. 4, 1908.

ber of short lengths, .even though the width and aggregate length remain the same. 'lihe applicants have found, moreover, that the interposition of a surface directly below the opening in the grate will also prevent the coal' from sifting through in a very large measure.

lnthe accompanying drawings, forming a part of this specification, Figure 1 is a side view showing a portion of a traveling grate composed of grate bars embodying our invention. Fig. 2 shows in perspective three of the bars shown in Fig. 1. Fig. 3 is a top view of a chain grate showing how the bars intermesh and partially broken away to show the complete bars in full lines. Figs. 4, 5, 6

and 7 a re side views of portions of connected bars of modilied construction. Figs. 8 and 1t) cross-sectional views; and Figs. 9 and 11 plan. view of other modified forms.

The bars A are cut away at the ends a and are provided with lugs a midway of their length projecting outwardlyf'rom the body of each bar. 'lhesc lugs are of such form that when the bars are mounted upon transverse rods l5, and connected to form a chain, the lugs lit into the. openings formed between the ends of the adjoining bars of the chain.

The form of bar shown in Figs. 1,2311! 3 is the one'preferred by us, as it facilitates means for sealing the rear end of chain grates constructed on this plan against excessive leahage of air. As therein represented, each bar A which is or may be of ordinaryconstrilction in other respects, has each of its ends beveled or inclined at a, and on' each side of each bar is cast or otherwise formed at the mid length of the bar a projecting lug 11.. of depending triangular formation, so that when the bars arc jointed on the cross rods 13 and assembled together, shown, the abutting ends of the bars and the projecting lugs close the'spaces between.

l ach of the lugs in the example illustrated s one-half the width of .the bar, but it is and made of the full side of the bar only,

the entire width of the. latter so as to cover spnee bet-ween'the adjacent bars sullicient to pH- sent the passing of pulverulent fuel.

In 'he, plan view, Fig. 3, the plane of the gratl is shown made up of the assembled l ban which are constructed as described and said bar or rod bein carried on a chain or other suitable jointed It'will be observed'inall these structures which collectively form a fire surface in continuity suflicient to prevent sifting of a pulverulent fuel without material Waste.

It will be observed'that the outer rows of the bars are constructed alternately with but one rejecting lug, as at h, and with an extended lug at d, in order to fill in the spaces at the extreme sides or edges of the grate. 4 The construction described has also the advantage, only heretofore attained with forms of traveling grates consisting of trans- -verse bars carried upon suitable travehng gear at the ends and arranged to 1nt-er.

chain grates having rounded ends, of clearing the usual dumping plate as at D in passing o've r'the carrier C of the grate support in that the dumping plate is notunduly raised to destroy the air seal thereby formed. The

same results as to the prevention of sifting of fin'ecoal, however, may be obtained by the use of barsof other forms, as shown, for

example, in Fig. 4, 5,6 and 7. In all of these structures the bar is provided with a lug upon its middle ortion projecting laterally from the body 0 the bar, and of such form as to fitin'to the opening between the ends of the ad'acent bars.

In ig. S a structure 1s shown embodying our invention which may be used inthose mesh, forming a continuous grate surface; -Bars of this structure v rtually consist of a series of bars (as A)'held in' position by, and

integral with, .a bar depending therefrom with a rod connecting the, depending part,

gear at the ends.

that the outer row of bars are varied slightly in form to make a. flush face at the sides of bars.

- 3. In a traveling grate a plurality of bars each, provided with lateralprojections extending over the ends of adjacent bars said bars being so arranged as to provide nonverti'cal air spaces between them.

4. plurality of bars'suitably connected, each or having its ends depressed below the fire jectionsbetween its ends extending laterally and madefiush with the fire, surface of the grate, 's aid'. projections substantially fitting 'into and interineshing'with the depressions between the abutting ends of the adjacent bars. In testimony whereof we affix our signatures in presence of two witnesses.

ALFRED EDWARD PARKER.

ERN S A O Witnesses for Parker: W LLaoE 'FAIRWEATHER, JOHN ARfMsro 'G, Jr. Witnessesffor. Peabody: EUGENE P. TERRY,

CHAS; W. Forums.

In a traveling grate composed of a surface of the'grate and provided with pro- 40 the furnace. Thus the bars have lugs projsuitable lateral connections between said 

